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Method for preparing a carbon/carbon composite

a carbon/carbon composite and composite technology, applied in the field of carbon/carbon composite preparation, can solve the problems of localized delamination and/or other damage to the matrix structure, and achieve the effects of high heating rate, acceptable tribological performance, and comparable mechanical properties

Inactive Publication Date: 2011-01-18
NAT CHENG KUNG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

"The present invention provides a method for preparing a carbon / carbon (C / C) composite by heating a carbon fiber-reinforced polymer matrix composite precursor at a high heating rate of 20-1500°C / min during carbonization. This method allows for the successful preparation of a C / C composite without disintegration during the fast carbonization process. The resulting C / C composite has comparable mechanical properties and an acceptable tribological performance, which can be further improved with a post-treatment. The method can be carried out using an open-end induction furnace and can use various carbon fibers and polymers. The carbonization process can be carried out at a heating rate of greater than 20°C / min. The technical effects of this invention include the ability to prepare high-quality C / C composites with improved mechanical properties and a more desirable tribological performance."

Problems solved by technology

Not only the properties, the economical efficacy of a C / C composite is critically dependent on a careful control of its carbonization process due to the fact that carbonization is one of the most time and energy-consuming steps in the entire fabrication process of C / C composites, especially for those densified by liquid phases.
This temperature gradient could result in a non-uniform carbonization, creating internal stresses through the laminates, which in turn, might lead to localized delamination and / or other damages to the char structure of the matrix.

Method used

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  • Method for preparing a carbon/carbon composite

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0057]C / C composites were prepared from different fiber volume fractions and carbonization rates. The carbon fibers were random type. The specimen dimensions were 50×20×10 mm. The samples were processed to stage C1. The PAN-based carbon fibers (Torayca T700S, 12K, Toray Co., Japan), chopped to length 4.5 mm were first impregnated with a resole-type phenolic resin (PF-650, Chang Chun Petrochemical Industry, Taiwan) in a plastic mold in vacuum to form a prepreg. The prepreg was placed in an oven at 70° C. for 6 hours to remove excess solvent, followed by a hot press curing process in a stainless steel mold at 400 psi, and 160° C. for 30 min. The cured composite was sectioned into 50 mm×20 mm×10 mm coupons using a water-cooled diamond saw, followed by a post-curing process at heating rate 1° C. / min till 160° C., then 0.5° C. / min to 230° C., held for 2 hours in an air-circulated oven.

[0058]Carbonization was conducted by heating the post-cured composite in nitrogen atmosphere to 1000° C....

example 2

[0080]The procedures of example 1 were repeated with six different kinds of fibers. A fixed fiber volume fraction (50 vol %) and two different carbonization rates, 100 and 600° C. / min, were used. The properties were determined using the same method as in Example 4.

Sample Preparation

Fiber:

[0081]L: Toray T-700S PAN-based fiber, chopped to length 12 mm

[0082]H: Toray T-700S PAN-based fiber, chopped to length 4.5 mm

[0083]P: Thorne P25W pitch-based fiber, chopped to length 12 mm

[0084]T: Toray T-300 PAN-based fiber, chopped to length 12 mm

[0085]PW: PAN-based 2D woven cloth[0086]Resin: Phenolic resin PF-650 (resole-type)[0087]Hot press: 400 psi, 160° C. for 30 min.[0088]Specimen dimensions: 50×20×10 mm

Carbonization Rate:[0089](1) 100° C. / min till 1200° C., held for 3 min.[0090](2) 600° C. / min till 1200° C., held for 3 min.

Furnace for Carbonization Process:[0091]High temperature tube furnace (Model Number: F59348CM, Barnstead / Thermolyne, USA)

Sample Process Stage: C1

Measurements[0092]Density ...

example 3

[0102]The PAN-based carbon fibers (Torayca T700S, 12K, Toray Co., Japan), chopped to length 4.5 mm were first impregnated with the Resole-type phenolic resin (PF-650, Chang Chun Petrochemical Industry, Taiwan) in a plastic mold in vacuum to form a prepreg. The carbon fibers were random type. The prepreg was placed in an oven at 70° C. for 6 hours to remove excess solvent, followed by a hot press curing process in a stainless steel mold with a vacuum bag at 400 psi and 160° C. for 30 min. The cured composite was sectioned into 50 mm×10 mm×2.5 mm coupons using a water-cooled diamond saw, followed by a post-curing process at heating rate 1° C. / min. till 160° C., then 0.5° C. / min. to 230° C., hold for 8 hr. in an air-circulated oven.

[0103]Carbonization was conducted by heating the post-cured composite in nitrogen atmosphere to 1200° C. at five different heating rates: 1, 15, 100, 300 and 1000° C. The carbonization at heating rates 1 and 15° C. / min were conducted in an ordinary furnace h...

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Abstract

A method for preparing a carbon / carbon (C / C) composite comprising carbonizing a carbon fiber-reinforced polymer matrix composite precursor by heating the precursor in an inert atmosphere with a heating rate greater than 20° C. / min up to 1500° C. / min.

Description

FIELD OF THE INVENTION[0001]The present invention is related to a method for preparing carbon / carbon (C / C) composite, and in particular to a method for preparing carbon / carbon (C / C) composite by fast carbonization.BACKGROUND OF THE INVENTION[0002]Carbonization plays an important role in preparing a carbon / carbon (C / C) composite. Not only the properties, the economical efficacy of a C / C composite is critically dependent on a careful control of its carbonization process due to the fact that carbonization is one of the most time and energy-consuming steps in the entire fabrication process of C / C composites, especially for those densified by liquid phases.[0003]Logically the simplest way to reduce the manufacturing cost of C / C composites is to increase the carbonization rate, which is usually very low. However, carbonization is primarily a process of pyrolysis of hydrocarbons of a carbon precursor. The pyrolysis of hydrocarbons generally involves such processes as the cleavage of C—H an...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): C01B31/04C01B31/00B29C48/76
CPCB82Y30/00F16D69/023C04B35/6267C04B35/6269C04B35/83C04B35/522C04B2235/5268C04B2235/526C04B2235/5252C04B2235/5256C04B2235/424C04B2235/425C04B2235/5436C04B2235/5454C04B2235/616C04B2235/6562C04B2235/77C04B2235/96Y10S977/742
Inventor LIN, JIIN-HUEY CHERNJU, CHIEN-PINGKUO, HUA-HSUANHO, SHU-CHINGCHEN, SENG-MENG
Owner NAT CHENG KUNG UNIV
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